On Mon, Jan 2, 2017 at 6:06 AM, Russell King - ARM Linux
[off-list ref] wrote:

On Mon, Dec 26, 2016 at 05:01:02PM +0530, Bhumika Goyal wrote:

quoted

The object armada38x_rtc_ops of type rtc_class_ops structure is not
modified after getting initialized by armada38x_rtc_probe. Apart from
getting referenced in init it is also passed as an argument to the function
devm_rtc_device_register but this argument is of type const struct
rtc_class_ops *. Therefore add __ro_after_init to its declaration.

What I'd prefer here is for the structure to be duplicated, with one
copy having the alarm methods and one which does not.  Both can then
be made "const" (so placed into the read-only section at link time)
and the probe function select between the two.

I think that's a cleaner and better solution, even though it's
slightly larger.

I'm not a fan of __ro_after_init being used where other solutions are
possible.

Can the pointer that points to the struct rtc_class_ops be made ro_after_init?

-Kees

-- 
Kees Cook
Nexus Security

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